For example:
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When you open a fresh jar of peanut butter do you only work through one side until it is completely empty then start on the other side?
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Or when you get those shallow tubs of hummus does it have to make it back home undisturbed? Then one of the baggers at the grocery store shoves it sideways into the bag completely ruining the symmetry.
I see your point, thanks for the insight! Did you base your reply on the abstract or the full article, because they do specify “vegetable” oil. Also, in their defence, they not only state that they only intended to show a correlation instead of a causal effect, and even add that: